Normalization of deviance can't be trained away or engineered out. Part two examines what training, design, and culture can realistically do — and where each one falls short. The tools exist. The question is whether the people using them are actually holding the standard, or just going through the motions.

Visual separation works. It has worked countless times and will work countless more. But it works only under one condition: that the pilots who invoke it hold those words to their fullest meaning. A look into two accidents caused by the same normalized deviance

Normalization of deviance doesn't discriminate by experience level or aircraft type. It is a challenge that designers, regulators, and instructors continue to wrestle with. Why does it occur? How did it start? What can we do?